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Add Binary <leetcode>

Given two binary strings, return their sum (also a binary string).

For example,
a = "11"
b = "1"
Return "100".

 

算法:模拟加法过程

 1 class Solution { 2 public: 3     string addBinary(string a, string b) { 4         int  len1=a.size(); 5         int  len2=b.size(); 6         int c=0; 7         reverse(a.begin(),a.end()); 8         reverse(b.begin(),b.end()); 9         string s="";10         int len=max(len1,len2);11         for(int i=0;i<len;i++)12         {13             int t=0;14             if(i<len1)  t+=a[i]-0;15             if(i<len2)  t+=b[i]-0;16             t+=c;17             c=t/2;18             s=(char)(t%2+0)+s;19         }20         if(c>0) s=(char)(c+0)+s;21         return s;22     }23 };

 

Add Binary <leetcode>